# std::literals::chrono_literals::operator""min

From cppreference.com
< cpp‎ | chrono

Defined in header `<chrono>` |  |
constexpr chrono::minutes operator""min( unsigned long long mins ); | (1) | (since C++14)
constexpr chrono::duration</*unspecified*/, ratio<60,1>> operator""min( long double mins ); | (2) | (since C++14)

Forms a std::chrono::duration literal representing minutes.

1) Integer literal, returns exactly std::chrono::minutes(mins).
2) Floating-point literal, returns a floating-point duration equivalent to std::chrono::minutes.

### Parameters

mins | - | the number of minutes

### Return value

The std::chrono::duration literal.

### Possible implementation

    constexpr std::chrono::minutes operator""min(unsigned long long m)
    {
        return std::chrono::minutes(m);
    }
    constexpr std::chrono::duration<long double,
                                    std::ratio<60,1>> operator""min(long double m)
    {
        return std::chrono::duration<long double, ratio<60,1>> (m);
    }

### Notes

This operator is declared in the namespace std::literals::chrono_literals, where both literals and chrono_literals are inline namespaces. Access to this operator can be gained with:

- using namespace std::literals,
- using namespace std::chrono_literals, or
- using namespace std::literals::chrono_literals.

In addition, within the namespace std::chrono, the directive using namespace literals::chrono_literals; is provided by the standard library, so that if a programmer uses using namespace std::chrono; to gain access to the classes in the chrono library, the corresponding literal operators become visible as well.

### Example

Run this code

    #include <chrono>
    #include <iostream>

    int main()
    {
        using namespace std::chrono_literals;
        auto lesson = 45min;
        auto halfmin = 0.5min;
        std::cout << "One lesson is " << lesson.count() << " minutes"
                     " (" << lesson << ")\n"
                  << "Half a minute is " << halfmin.count() << " minutes"
                     " (" << halfmin << ")\n";
    }

Output:

    One lesson is 45 minutes (45min)
    Half a minute is 0.5 minutes (0.5min)

### See also

(constructor) | constructs new duration (public member function of `std::chrono::duration<Rep,Period>`)

Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/chrono/operator%22%22min&oldid=157650"